linux-kernel - [PATCH v2] drm/sched/tests: Use one lock for fence context

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Message-ID: <20250527101029.56491-2-phasta@kernel.org>
Date: Tue, 27 May 2025 12:10:30 +0200
From: Philipp Stanner <phasta@...nel.org>
To: Matthew Brost <matthew.brost@...el.com>,
	Danilo Krummrich <dakr@...nel.org>,
	Philipp Stanner <phasta@...nel.org>,
	Christian König <ckoenig.leichtzumerken@...il.com>,
	airlied@...il.com,
	Simona Vetter <simona@...ll.ch>,
	Tvrtko Ursulin <tvrtko.ursulin@...lia.com>
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm/sched/tests: Use one lock for fence context

There is no need for separate locks for single jobs and the entire
scheduler. The dma_fence context can be protected by the scheduler lock,
allowing for removing the jobs' locks. This simplifies things and
reduces the likelyhood of deadlocks etc.

Replace the jobs' locks with the mock scheduler lock.

Signed-off-by: Philipp Stanner <phasta@...nel.org>
---
Changes in v2:
  - Make commit message more neutral by stating it's about simplifying
    the code. (Tvrtko)
---
 drivers/gpu/drm/scheduler/tests/mock_scheduler.c | 5 ++---
 drivers/gpu/drm/scheduler/tests/sched_tests.h    | 1 -
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/scheduler/tests/mock_scheduler.c b/drivers/gpu/drm/scheduler/tests/mock_scheduler.c
index f999c8859cf7..17023276f4b0 100644
--- a/drivers/gpu/drm/scheduler/tests/mock_scheduler.c
+++ b/drivers/gpu/drm/scheduler/tests/mock_scheduler.c
@@ -64,7 +64,7 @@ static void drm_mock_sched_job_complete(struct drm_mock_sched_job *job)
 
 	job->flags |= DRM_MOCK_SCHED_JOB_DONE;
 	list_move_tail(&job->link, &sched->done_list);
-	dma_fence_signal(&job->hw_fence);
+	dma_fence_signal_locked(&job->hw_fence);
 	complete(&job->done);
 }
 
@@ -123,7 +123,6 @@ drm_mock_sched_job_new(struct kunit *test,
 	job->test = test;
 
 	init_completion(&job->done);
-	spin_lock_init(&job->lock);
 	INIT_LIST_HEAD(&job->link);
 	hrtimer_setup(&job->timer, drm_mock_sched_job_signal_timer,
 		      CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
@@ -169,7 +168,7 @@ static struct dma_fence *mock_sched_run_job(struct drm_sched_job *sched_job)
 
 	dma_fence_init(&job->hw_fence,
 		       &drm_mock_sched_hw_fence_ops,
-		       &job->lock,
+		       &sched->lock,
 		       sched->hw_timeline.context,
 		       atomic_inc_return(&sched->hw_timeline.next_seqno));
 
diff --git a/drivers/gpu/drm/scheduler/tests/sched_tests.h b/drivers/gpu/drm/scheduler/tests/sched_tests.h
index 27caf8285fb7..fbba38137f0c 100644
--- a/drivers/gpu/drm/scheduler/tests/sched_tests.h
+++ b/drivers/gpu/drm/scheduler/tests/sched_tests.h
@@ -106,7 +106,6 @@ struct drm_mock_sched_job {
 	unsigned int		duration_us;
 	ktime_t			finish_at;
 
-	spinlock_t		lock;
 	struct dma_fence	hw_fence;
 
 	struct kunit		*test;
-- 
2.49.0